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Push pull tube bushing

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jareds(at)verizon.net
Guest

Posted: Fri May 15, 2009 7:41 pm Post subject: Push pull tube bushing

Doin the annual on kf model IV and noticed the bushing on the push pull 

tube has popped out of the steel ring in the center of the aft portion 

of plane.

I know it is only there as a guide but have no idea how one would change 

it out or if you can even get one from KF?

I've always lubed with silicone and am wondering if greasing the outer 

ring that the tube slides in will suffice?

Suggestions?

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Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Sat May 16, 2009 5:08 am Post subject: Re: Push pull tube bushing

 	  jareds(at)verizon.net wrote: 	
		  Doin the annual on kf model IV and noticed the bushing on the push pull 

tube has popped out of the steel ring in the center of the aft portion 

of plane.

I know it is only there as a guide but have no idea how one would change 

it out or if you can even get one from KF?

I've always lubed with silicone and am wondering if greasing the outer 

ring that the tube slides in will suffice?

Suggestions? 	




The elevator push pull tube bushing needs to be secure in the steel ring.  The purpose is to keep the tube straight during up elevator pressure.



Do you have an inspection ring installed in belly fabric just forward of the front end of the large tube?  That inspection ring was installed so that the tube and bushing can be removed from the fuselage.  The installation procedure is to secure the bushing in the steel  ring with structural adhesive and then safety wire through a hole you drill in the lip of the bushing.



If there is no inspection ring there you can install one now.  I have the instructions in my notes.  An inspection ring in the belly just forward or aft of the bushing makes maintenance much easier.  I put both in after I about went nuts trying to grease the bushing doing my first annual.



There used to be a two piece nylon bushing available.  Kitfox LLC may still have them.



I use white lithium grease on mine.  Smooth as silk.

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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

lcfitt(at)sbcglobal.net
Guest

Posted: Sat May 16, 2009 5:23 am Post subject: Push pull tube bushing

Can youi retrieve it and reinsert it in the ring.  As I recall, this 

happened to me.  Having a lathe, I made a new bushing with a groove in it 

and then slit it with an angled cut, placed it over the tube and into the 

ring and then put a snap ring to keep it in place.  With the new build, that 

is how I am doing it now.



Lowell



---

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jareds(at)verizon.net
Guest

Posted: Sat May 16, 2009 5:37 am Post subject: Push pull tube bushing

I can retrieve it or at least part of it and prob glue it back in place 

for now but having another in hand for later would be nice.

I'm betting that the front portion of this plastic bushing had a lip on 

it and it is now gone.  But hopefully a little glue will hold it.  I 

always used litheum grease on it but can't remember if i have an 

inspection door under there or not.  I will certainly put one in if i dont.

Any chance you have a tail spring laying around for the KF IV



Lowell Fitt wrote:



[quote] 



 Can youi retrieve it and reinsert it in the ring.  As I recall, this 

 happened to me.  Having a lathe, I made a new bushing with a groove in 

 it and then slit it with an angled cut, placed it over the tube and 

 into the ring and then put a snap ring to keep it in place.  With the 

 new build, that is how I am doing it now.



 Lowell



 ---

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lcfitt(at)sbcglobal.net
Guest

Posted: Sat May 16, 2009 7:20 am Post subject: Push pull tube bushing

Tom,



I find this description interesting.  If you glue the bushing in with 

structural adhesive, and assuming this stuff sticks, the inspection ring 

will be pretty much a cosmetic featrure as the rivets holding the rod end 

stud will prevent the push/pull tube from sliding past the bushing.  Also if 

the bushing is installed with the lip aft, it will not be removable.  I 

dealt with this years ago and after the ring slipped out, I replaced it with 

a split one and the old one just rode along as a light weight passenger 

after that.



The real key is a two piece or split ring held in place with a snap ring.



Lowell

---

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Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Sat May 16, 2009 3:13 pm Post subject: Re: Push pull tube bushing

 	  lcfitt(at)sbcglobal.net wrote: 	
		  Tom,



I find this description interesting.  If you glue the bushing in with 

structural adhesive, and assuming this stuff sticks, the inspection ring 

will be pretty much a cosmetic featrure as the rivets holding the rod end 

stud will prevent the push/pull tube from sliding past the bushing.  Also if 

the bushing is installed with the lip aft, it will not be removable.  I 

dealt with this years ago and after the ring slipped out, I replaced it with 

a split one and the old one just rode along as a light weight passenger 

after that.



The real key is a two piece or split ring held in place with a snap ring.



Lowell

--- 	




Lowell, I had to go take a look at what I actually did so I could remember.  I didn't like the idea of not being able to remove the push pull tube.  I slit the bearing  to clear the bushing rivets and saftey wired it to secure it in the metal ring in the fuselage.  No epoxy.  I put the inspection ring in the belly incase the tube needs to be removed some time.  I was going on memory on the epoxy.  Blame it on the sixtys.  I'm sixty now.

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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

lcfitt(at)sbcglobal.net
Guest

Posted: Sat May 16, 2009 4:48 pm Post subject: Push pull tube bushing

Tom,



I got you beat on the numbers game, but it just happens that is what I am 

working on with the new project.  My set-up is exactly what you came up 

with.  In fact I just removed the tube to alodyne it and it came out just as 

you suggest.  My bushing is also of the split variety, but with a snap ring.



Lowell

---

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